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Finding the Fourth Proportional to 28,655.78, 42,987.98 and 8,935.88

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Solution

The fourth proportional to 28,655.78, 42,987.98 and 8,935.88 is: 13,405.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,655.78 : 42,987.98 = 8,935.88 : x
  2. Step 2: Convert to fraction form
    28,655.78/42,987.98 = 8,935.88/x
  3. Step 3: Cross multiply
    28,655.78x = 42,987.98 × 8,935.88
  4. Step 4: Simplify right side
    28,655.78x = 384,135,238.12
  5. Step 5: Solve for x
    x = 384,135,238.12/28,655.78
  6. Step 6: Final answer
    x = 13,405.16

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.